. Interpretation of dental and maxillary roentgenograms . Fig. 29.—Diagram giving the angles of the tube in making stereograms of the jaws and teeth. as impacted third molars, or where a considerable area isto be examined, as in the case of fractures, embeddedbullets, etc. Technic The technic of plate stereograms will be described operation involves making tAvo exposures Avith the METHODS OF LOCALIZATION 69 tube in different positions. The first exposure is madewith the same position of tube and patient as for a singleplate described on p. 56. (Figs. 28 and 29-A.) Thepatient is instr
. Interpretation of dental and maxillary roentgenograms . Fig. 29.—Diagram giving the angles of the tube in making stereograms of the jaws and teeth. as impacted third molars, or where a considerable area isto be examined, as in the case of fractures, embeddedbullets, etc. Technic The technic of plate stereograms will be described operation involves making tAvo exposures Avith the METHODS OF LOCALIZATION 69 tube in different positions. The first exposure is madewith the same position of tube and patient as for a singleplate described on p. 56. (Figs. 28 and 29-A.) Thepatient is instructed to keep the head in exactly the sameposition for the two exposures, as any movement willinterfere with the stereoscopic effect. Care must alsobe taken to place the second plate in exactly the same posi-tion as the first, which is easily accomplished by means. Fig. 30.—Position and angle of tube for second in plate stereogram of the jaws. of lines ruled on the plate rest or by means of a specialslot arrangement in the plate rest into which the platescan be slipped. The first plate having been slid out fromunder the patients head and the second plate placed inthe same position, the tube is shifted three inches in to-ward the upright stand. In order for the central ray tostrike the second plate at the same point as in the first,it becomes necessary to change the aneie of the funnel 70 INTERPRETATION^ OF ROENTGENOGRAMS from 30 degrees to 17^ degrees from the vertical (Figs. 30 and 29-B). The second exposure is now made, exactlythe same time being given as in the first exposure. Afterdevelopment, the plates may, of course, be vieAved throughthe large Wheatstone stereoscope. If this instrument isnot available, lantern slides or prints can be made fromcorresponding parts of the two plates, and viewed verysatisfactorily through the ord
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectradiographydental
